* IEA: China overtook the U.S. last year to become the world's biggest energy user
* Beijing's new status is expected to make it even more influential in global energy markets
* China to increasingly determine global energy use, from types of cars, power plants built
* China last year consumed 2,252 million tons of oil, about 4 percent more than the U.S.

London, England (FT.com) -- China overtook the U.S. last year to become the world's biggest energy user, the International Energy Agency revealed on Monday.

Beijing's new status is expected to make it even more influential in global energy markets, in determining prices and how it is used.

China clinched the top slot more quickly than had been expected because the U.S. has over the past decade far outpaced China in using energy more efficiently. On a per capita basis, the U.S. still uses far more energy than China and remains less efficient than Europe.

Fatih Birol, the IEA's chief economist, said: "In the 2000, the US consumed twice as much energy as China, now China consumes more than the U.S." He noted that the U.S. had improved the efficiency with which it uses energy by 2.5 percent annually during that time, while China managed only a 1.7 percent annual improvement.

"On the one hand, the U.S. has come to a certain saturation of energy use, but there have also been lots of efforts, especially since 2005, to use energy more efficiently," he said.

China last year consumed 2,252 million tons of oil equivalent of energy from sources including coal, oil, nuclear power, natural gas and hydropower, about 4 percent more than the U.S., the rich countries' watchdog said.

China's growth has also not suffered the same setback as that of the U.S. following the global financial crisis.

In 2008 it pushed oil prices to record highs, which helped tip the world into recession. Mr Birol said China's increased need for imports of coal and gas could eventually have a similar impact.

A second big consequence of China's growing heft as an energy consumer is that the country will thus increasingly determine how energy is used on a global scale -- from the types of cars manufactured to the kinds of power plants built. This means China will also determine energy consumption patterns outside its borders. "There will be a big multiplier effect," Mr Birol said.

China is already by far the world's largest user of coal. Despite its own vast resources, its imports of thermal coal are expected to hit 105-115 million tonnes this year, pushing it ahead of Japan as the world's largest coal importer. Only three years ago China was a net coal exporter.

The trend has also been apparent in oil. Saudi Arabia, the world's most important oil exporter, for the first time last year sold more oil to China than the U.S., which for decades had been its most important customer.